Smoking causes serious harm to human health. The smoke from cigarettes contains over 4000 chemicals including tar, nicotine, and carbon monoxide. These chemicals can cause cancer, damage lung function, and increase the risk of heart disease and stroke. Tar contains cancer-causing chemicals that lead to lung cancer by causing abnormal cell growth in the lungs. Nicotine is highly addictive and raises heart rate and blood pressure. Carbon monoxide reduces the blood's ability to carry oxygen throughout the body.

1. Effects of tobacco smoke on Human Health

16. Differences between Respiration and Photosynthesis Results in the gain of dry mass Results in loss of dry mass Occurs only in cells containing chlorophyll and in the presence of sunlight Occurs at all times in all cells, independent of chlorophyll and sunlight An anabolic process, resulting in the building up of carbohydrate molecules A catabolic process, resulting in the breakdown of carbohydrate molecules CO 2 and H 2 O are used whereas O 2 is given off O 2 is used, and CO 2 and H 2 O are given off Energy is stored in carbohydrate molecules Energy is released Photosynthesis Respiration